package com.xiannimei.web.controller;

import java.awt.image.BufferedImage;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * @author xinyuan.guo
 *
 * @createDate 2013-7-3 上午11:28:52
 *
 */
@Controller
public class CaptchaController {

	@Resource(name = "captchaProducer") private Producer captchaProducer;

	public void setCaptchaProducer(Producer captchaProducer) {
		this.captchaProducer = captchaProducer;
	}

	/**
	 * 生成验证码。
	 */
	@RequestMapping(value = "/captcha")
	public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
		response.setDateHeader("Expires", 0);
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setContentType("image/jpeg");

		String capText = captchaProducer.createText();
		// store the text in the session
		request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
		// create the image with the text
		BufferedImage bi = captchaProducer.createImage(capText);
		ServletOutputStream out = response.getOutputStream();
		ImageIO.write(bi, "jpg", out);
		try {
			out.flush();
		} finally {
			out.close();
		}
	}
}
